Go to file
Arthur O'Dwyer 16031cbf2b [libc++] Fix LWG3557 "static_cast expression in convertible_to has the wrong operand"
https://cplusplus.github.io/LWG/issue3557
I think the code change is unobservable, so we could just close this as
"Nothing To Do" instead; but it seems appropriate to follow the Standard's
wording here as closely as possible.

Differential Revision: https://reviews.llvm.org/D117964
2022-01-26 19:32:46 -05:00
.github workflows: Make issue-subscriber more robust for labels with special characters 2022-01-14 22:04:54 -08:00
bolt [BOLT] Fix DWARFv5 for aarch64 2022-01-27 02:14:58 +03:00
clang [FIX][clang] Fix unused private field in ExtractAPIVisitor 2022-01-26 16:24:04 -08:00
clang-tools-extra [CodeCompletion][clangd] Clean __uglified parameter names in completion & hover 2022-01-26 15:51:17 +01:00
cmake Revert "[cmake] Duplicate `{llvm,compiler_rt}_check_linker_flag` for runtime libs and llvm" 2022-01-21 09:53:14 -08:00
compiler-rt [CMake] Use generator expression to get in-tree libc++ path 2022-01-26 14:12:48 -08:00
cross-project-tests [Dexter] Remove false requirement of lldb for dexter regression tests on Windows 2022-01-26 11:33:50 +00:00
flang [flang][tco] Remove unneeded dependencies 2022-01-26 13:02:58 +00:00
libc [libc] Make logf function correctly rounded for all rounding modes. 2022-01-25 15:22:21 -05:00
libclc libclc: Add clspv64 target 2022-01-13 09:28:19 +00:00
libcxx [libc++] Fix LWG3557 "static_cast expression in convertible_to has the wrong operand" 2022-01-26 19:32:46 -05:00
libcxxabi [demangler] refactor SpecialSubKind 2022-01-26 04:59:25 -08:00
libunwind Revert "[cmake] Duplicate `{llvm,compiler_rt}_check_linker_flag` for runtime libs and llvm" 2022-01-21 09:53:14 -08:00
lld [ELF] Simplify writing the Elf_Chdr header. NFC 2022-01-26 10:23:56 -08:00
lldb [lldb/test] Skip TestSBModule unless darwin 2022-01-27 01:05:12 +01:00
llvm [gn build] Remove unnecessary include_dirs 2022-01-26 15:40:54 -08:00
mlir [mlir][amx] fix some whitespace issues in AMX tests 2022-01-26 16:00:03 -08:00
openmp [openmp] Disable build of old runtimes by default 2022-01-26 19:17:31 +00:00
polly Add missing llvm/support/Regex.h include in polly/lib/Analysis/ScopDetection.cpp 2022-01-21 16:04:37 +01:00
pstl [cmake] Make include(GNUInstallDirs) always below project(..) 2022-01-20 18:59:17 +00:00
runtimes Revert "[cmake] Duplicate `{llvm,compiler_rt}_check_linker_flag` for runtime libs and llvm" 2022-01-21 09:53:14 -08:00
third-party Ensure newlines at the end of files (NFC) 2021-12-26 08:51:06 -08:00
utils [bazel] Port 480cd4cb 2022-01-26 23:24:45 +01:00
.arcconfig Add modern arc config for default "onto" branch 2021-02-22 11:58:13 -08:00
.arclint PR46997: don't run clang-format on clang's testcases. 2020-08-04 17:53:25 -07:00
.clang-format Revert "Title: [RISCV] Add missing part of instruction vmsge {u}. VX Review By: craig.topper Differential Revision : https://reviews.llvm.org/D100115" 2021-04-14 08:04:37 +01:00
.clang-tidy Add modernize-use-default-member-init.UseAssignment to .clang-tidy 2022-01-23 20:32:52 -08:00
.git-blame-ignore-revs [lldb] Add 9494c510af to .git-blame-ignore-revs 2021-06-10 09:29:59 -07:00
.gitignore [NFC] Add CMakeUserPresets.json filename to .gitignore 2021-01-22 12:45:29 +01:00
.mailmap Add self to .mailmap 2021-10-12 15:51:01 +02:00
CONTRIBUTING.md docs: update some bug tracker references (NFC) 2022-01-10 15:59:08 -08:00
README.md Remove unused parallel-libs project 2021-10-21 14:34:39 -07:00
SECURITY.md [docs] Describe reporting security issues on the chromium tracker. 2021-05-19 15:21:50 -07:00

README.md

The LLVM Compiler Infrastructure

This directory and its sub-directories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and run-time environments.

The README briefly describes how to get started with building LLVM. For more information on how to contribute to the LLVM project, please take a look at the Contributing to LLVM guide.

Getting Started with the LLVM System

Taken from https://llvm.org/docs/GettingStarted.html.

Overview

Welcome to the LLVM project!

The LLVM project has multiple components. The core of the project is itself called "LLVM". This contains all of the tools, libraries, and header files needed to process intermediate representations and convert them into object files. Tools include an assembler, disassembler, bitcode analyzer, and bitcode optimizer. It also contains basic regression tests.

C-like languages use the Clang front end. This component compiles C, C++, Objective-C, and Objective-C++ code into LLVM bitcode -- and from there into object files, using LLVM.

Other components include: the libc++ C++ standard library, the LLD linker, and more.

Getting the Source Code and Building LLVM

The LLVM Getting Started documentation may be out of date. The Clang Getting Started page might have more accurate information.

This is an example work-flow and configuration to get and build the LLVM source:

  1. Checkout LLVM (including related sub-projects like Clang):

    • git clone https://github.com/llvm/llvm-project.git

    • Or, on windows, git clone --config core.autocrlf=false https://github.com/llvm/llvm-project.git

  2. Configure and build LLVM and Clang:

    • cd llvm-project

    • cmake -S llvm -B build -G <generator> [options]

      Some common build system generators are:

      • Ninja --- for generating Ninja build files. Most llvm developers use Ninja.
      • Unix Makefiles --- for generating make-compatible parallel makefiles.
      • Visual Studio --- for generating Visual Studio projects and solutions.
      • Xcode --- for generating Xcode projects.

      Some common options:

      • -DLLVM_ENABLE_PROJECTS='...' --- semicolon-separated list of the LLVM sub-projects you'd like to additionally build. Can include any of: clang, clang-tools-extra, compiler-rt,cross-project-tests, flang, libc, libclc, libcxx, libcxxabi, libunwind, lld, lldb, mlir, openmp, polly, or pstl.

        For example, to build LLVM, Clang, libcxx, and libcxxabi, use -DLLVM_ENABLE_PROJECTS="clang;libcxx;libcxxabi".

      • -DCMAKE_INSTALL_PREFIX=directory --- Specify for directory the full path name of where you want the LLVM tools and libraries to be installed (default /usr/local).

      • -DCMAKE_BUILD_TYPE=type --- Valid options for type are Debug, Release, RelWithDebInfo, and MinSizeRel. Default is Debug.

      • -DLLVM_ENABLE_ASSERTIONS=On --- Compile with assertion checks enabled (default is Yes for Debug builds, No for all other build types).

    • cmake --build build [-- [options] <target>] or your build system specified above directly.

      • The default target (i.e. ninja or make) will build all of LLVM.

      • The check-all target (i.e. ninja check-all) will run the regression tests to ensure everything is in working order.

      • CMake will generate targets for each tool and library, and most LLVM sub-projects generate their own check-<project> target.

      • Running a serial build will be slow. To improve speed, try running a parallel build. That's done by default in Ninja; for make, use the option -j NNN, where NNN is the number of parallel jobs, e.g. the number of CPUs you have.

    • For more information see CMake

Consult the Getting Started with LLVM page for detailed information on configuring and compiling LLVM. You can visit Directory Layout to learn about the layout of the source code tree.